Supporting device



FIG. 1 is a front, top and right side perspective view of a supporting device showing our new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a left side view thereof;

FIG. 9 is a front view showing the article in a different position;

FIG. 10 is a front view showing the article in another different position; and,

FIG. 11 is a front view showing the article connected with another supporting device.

The broken lines illustrate portions of the supporting device and form no part of the claimed design. 

CLAIM The ornamental design for a supporting device, as shown and described. 